must fortify
Verbo regular: fortify - fortified- fortified

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fortify
you must fortify
he must fortify
we must fortify
you must fortify
they must fortify 	I must be fortifying
you must be fortifying
he must be fortifying
we must be fortifying
you must be fortifying
they must be fortifying	I must have fortified
you must have fortified
he must have fortified
we must have fortified
you must have fortified
they must have fortified	I must have been fortifying
you must have been fortifying
he must have been fortifying
we must have been fortifying
you must have been fortifying
they must have been fortifying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't fortify
you mustn't fortify
he mustn't fortify
we mustn't fortify
you mustn't fortify
they mustn't fortify 	I mustn't be fortifying
you mustn't be fortifying
he mustn't be fortifying
we mustn't be fortifying
you mustn't be fortifying
they mustn't be fortifying	I mustn't have fortified
you mustn't have fortified
he mustn't have fortified
we mustn't have fortified
you mustn't have fortified
they mustn't have fortified	I mustn't have been fortifying
you mustn't have been fortifying
he mustn't have been fortifying
we mustn't have been fortifying
you mustn't have been fortifying
they mustn't have been fortifying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fortify?
must you fortify?
must he fortify?
must we fortify?
must you fortify?
must they fortify? 	must I be fortifying?
must you be fortifying?
must he be fortifying?
must we be fortifying?
must you be fortifying?
must they be fortifying? 	must I have fortified?
must you have fortified?
must he have fortified?
must we have fortified?
must you have fortified?
must they have fortified? 	must I have been fortifying?
must you have been fortifying?
must he have been fortifying?
must we have been fortifying?
must you have been fortifying?
must they have been fortifying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I fortify?
mustn't you fortify?
mustn't he fortify?
mustn't we fortify?
mustn't you fortify?
mustn't they fortify? 	mustn't I be fortifying?
mustn't you be fortifying?
mustn't he be fortifying?
mustn't we be fortifying?
mustn't you be fortifying?
mustn't they be fortifying? 	mustn't I have fortified?
mustn't you have fortified?
mustn't he have fortified?
mustn't we have fortified?
mustn't you have fortified?
mustn't they have fortified? 	mustn't I have been fortifying?
mustn't you have been fortifying?
mustn't he have been fortifying?
mustn't we have been fortifying?
mustn't you have been fortifying?
mustn't they have been fortifying?